I am using the Xfwm4 window manager.
I have recently installed fresh 18.2 64bit XFCE and restored most of home content from duplicity backup including some configuration (~/.config, etc.).

The window manager freezes every time I switch to different workspace. However I also experience the same issue after lunching some wine applications (maybe after others but I do not notice right away).
Sometimes when attempting to drag or resize a window it can be moved for a little bit (every attempt moves/resizes the window for few pixels)

I have removed ~/.config and restarted X session with no effect.
The ~/.cache/upstart/startxfce4.log which seems to hold some sort of logging information from Xfwm4 does log any information when switching workspaces or moving freezing windows.
Running xfwm4 --replace or changing window manager throw Desktop Settings temporarily fixes the issue.

I am looking for any advices on the subject or any help to diagnose the problem.

Hello, I have the same problem on a freshly installed 18.2 Sonya / XFCE.

Here is what I noticed:
* same "only a few-pixels" move or resize when it's stuck
* It seems to get stuck only when changing desktop with the keyboard shortcut, not by clicking on the desktop switcher widget
* seems specifically to be caused by Ctrl-F1 shortcut (not the -F2 / -F3 variants); Pressing it a second time resets to free movements.
* It also occured when I tried to reconfigure the desktop shortcuts to something else; I finally reset to the default shortcut because "something" seemed to always forget my configuration and only responds to the default (Ctrl-F1 /...) ones.

Probably Ctrl-F1 is also mapped to another action that interferes with move/resize.